Keep quoted text after as it is in plain-text mode
Keep quoted text after as it is in plain-text mode

Thunderbird adds an extra white-space in front of the lines that starts with the greater-than symbol (">"). This symbol is the quotation marker for plain-text messages.

To add the quoted text, in plain-text mode, it is necessary to call another function from the Thunderbird's interface, made specifically for this purpose.
exteditor/exteditor,exteditor/exteditor